Modify ContextHubInfo to implement Parcelable

Needed to resolve Java compilation errors when using e.g.
List<ContextHubInfo> in AIDL. Doesn't add the "final" qualifier,
since make will throw errors due to compatibility issues.

Bug: 67734082
Test: make update-api && make
Change-Id: Ie7f99a41eab70455b1c4e86b673e7377be667dfb